Ignition breaker mounting



Nov- 6, 1 6 w. J. RALEIGH 3,062,930

IGNITION BREAKER MOUNTING Filed Sept. 9, 1959 2 Sheets-Sheet 1 INVENTOR. 11/44. 754? .1 F44 5/4 lrraxwem 6, 1962 w. J. RALEIGH 3,062,930

IGNITION BREAKER MOUNTING Filed Sept. 9. 1959 2 Sheets-Sheet 2 FIG. 4B 4 I 3 |'4 46' I l l 28% I 36 Elli/NE COIVTRGL INVENTOR. Fl 51 4 Murat I/PfllE/Gl/ Chin 7 Arman/er:

United States Patent 3,062,930 1 IGNITION BREAKER MOUNTING Walter J. Raleigh, St. Paul, Minn., assignor to McCulloch Corporation, Marine Products Division, Minneapolis, Minn., a corporation of Minnesota Filed Sept. 9, 1959, Ser. No. 839,008 12 Claims. (Cl. 20031) This invention relates to spark advance devices for internal combustion engines and more specifically to a new and simplified mounting therefor.

It is an object of this invention to provide a spark advance device of simplified mounting for facilitating assembly and disassembly.

These and other more detailed and specific objects will be disclosed in the course of the following specification, reference being had to the accompanying drawings, in which:

FIG. 1 is a partial elevational view of an outboard motor having a cutaway portion showing a typical flywheel-ignition unit mounted 0H3 twoecycle engine.

FIG. 2 is a plan view as taken along lines 22 in FIG. 1 and only showing a typical electric generatorflywheel with an exemplary'embodirnent of the present invention installed thereunder.

FIG. 3 isavertical sectional view taken along lines 3-3 in FIG. 2.

- FIG.-4 is an inverted plan view showing the lower side of the FIG. 2 apparatus and as taken along lines 44 in FIG. 1.

With reference now to the accompanying drawing like numbers denote like parts and structural features in the various views. A power head of a typical outboard motor unit has a two-cycle engine 12 with an ignition breaker and electric generator unit 14. The generator includes a flywheel 16 with permanent magnets embedded therein in the usual manner andis mounted on one end portion of the drive shaft 18 which doubles as a timing shaft for the illustrated engine. A stationary coil mount member 20 is bolted to the. engine 12 as at 22 and stationarily supports the voltage generating coils 24 wound on the core 26. The core 26 is recurrently magnetically coupled to the rotating flywheel 16; per manent magnets for inducing voltages in coils 24 as is well known. The stationary coils permit closer tolerances between the core 26 and the flywheel 16 providing improved magnetic coupling therebetween.

A relatively light weight spark advance stator member 28 is rotatably disposed over the mount 20 and has an aperture therein aligned with a like central aperture members 20 and 28 are spring urgedapart the nylon buttons 38 are respectively engaged with the surfaces 40 providing the sole axial support for the spark member. As best seen in FIG. 3 the member 28 aperture rim axially slidably engages the outer surface of the bearing 42 for maintaining the concentricity of the spark member with the shaft 18.

The spark advance member is operatively connected to the usual engine and carburetor controls, schematically shown as block 43, by a rod 44 pivotally connected to the member as at 45. Spark advance synchronization with the engine operation is well known in the art and furthe discussion herein is believed unnecessary.

To disassemble the member 28 from the member 20, the nut 46 threaded on the threaded end portion of the shaft 18 is removed, the flywheel 16 is lifted off, the rod 44 removed and the ignition wires 34 are disconnected. Next the spark advance member 28 is rotated toward the radial notches 48 (FIG. 4) until the runners 36 are axially aligned therewith. r The member 28 is then lifted. axially away from the mount 20, the runners in the mount through which shaft 18 rotatably extends.

Shaft 18 has; a cam section 30 lubricated by the usual cam wipeir 31 and operatively engaging the ignition breaker .pointassemblies 32: for providing timed-, spark current through the wires 34 of a"usua l;electric, ignition system (not s o is rotated around the shaft 18, the spark timing provided by the point assembly 32 breaking will either advance or retard.

The member 28 has three depending L or hook shaped runners 36 extending toward and partially around the member 20. Each runner has an anti-friction plastic button 38 with an upwardly facing surface for engaging the metal slide surfaces 40 on the member 20. The surfaces 40 face away from the member 28 and are ma- .chined to be perpendicularto and concentric with the shaft'18 axis for providing a slide support for the member 28 through the buttons 38 over a timing adjustment range of fifty to sixty degrees. The spark-member 28 is yieldably upwardly urged by a spring washer 41 disposed about the shaft 18 between the upper end of the bearing 42 and the under surface of the spark member. As the It is apperciated-that as-the member 28 faces.

easily slipping through the notches48. To assemble a reverse process is followed. 3' 1 It is understood that suitable modifications may be made in the structure as disclosed, provided such modi= fications come with the spirit'and scope of the appended claims; Having now thereforefully illustrated and described myinvention, what I claim to be new and desire to protect by Letters Patent is: 7 1. For use in a spark advance device of an internal combustion engine, a timing shaft, a stationary member a spark advance member spaced apart from-the other member and circumferentially movable with respect to the timing shaft, one of the members having a plurality of slide surfaces facing away from the other member and each circumferentially extending like distances concentric with respect to the shaft for providing a timing adjustment range, a plurality of hook shaped 'runners on the other member and each having-a separate ant-i frictin portionin juxtaposition with one of the surfaces, and means engaging a member for urging the members apart to respectively engage the runners with the surfaces.

25For use in a spark advance device of an'internal combustion engine, a stationary mount member having an aperture for rotatably receiving a timing shaft, a spark advance member rotatably disposed with respect to the aperture and being adjacent the other member, one of the members having aplurality'ofsliding surfaces'op posite the other member and each surface extending concentric with respect to the aperture for 'providing a tiniing'adjustment range and each having a' radial notch at like ends, a plurality of'hook shaped runners on the member and each having a portion immediately adjacent "one of the surfaces and being slidable thereon such that the runners may be respectively axially moved; through the notches, and spring means for urging the members apart to respectively engage the runners with the sur- 3. For use in a spark advance of anintern'al combustion engine a stationary mount member, a timing shaft rotatably and adjacently disposed with respect-to said member, a spark advance member movably disposed. in parallel spaced apart relation to the stationary. member for movement "concentric with respect to the shaft, a plurality of, slide surfaces on one member concentricwith the shaft and facing away from the other membenjthe one member having a radially extending notch at like ends of each surface, a like plurality of hook shaped runners on the other member extending toward and beyond the one member with a portion of each runner member for axially urging the members apart to respectively engage the runner portions with the surfaces, and the spark advance member being movable for aligning the runners with said notches whereby the members may be separated by axial movement of the runners through the notches.

4. A spark advance mechanism for use -with an internal combustion engine, comprising a timing shaft having an axis of rotation, a stationary mount member having an aperture therein with the timing shaft extending there through, a spark advance member being rotatably disposed about the shaft in spaced apart parallel relation to the stationary member, one of the members having a plurality of arcuate slide surfaces concentric with the shaft and facing away from the other member, the other member having a like plurality of hook shaped runners extending toward and beyond the one member such that a portion of each runner is respectively adjacent one slide surface, spring means disposed around the shaft between the engine and the spark member urging it away from the stationary member whereby the runners slidably engage the surfaces, the one member having a like plurality of radial notches spaced in the same circumferential relation as said runners, and the spark member being rotatable in a plane transverse to the shaft axis for freeing the runners from the surfaces and aligning same with the respective notches to permit unlimited axial movement of the spark member away from the stationary member.

5. A spark advance mechanism for use in an engine having an electric ignition system comprising a stationary bearing, a timing shaft rotatably disposed through the bearing, a mount member stationarily associated with the bearing and having an aperture adjacent one end of the bearing, a spark advance member rotatably disposed about and circumferentially movably engaging the bearing for maintaining concentricity with the shaft and being in axial spaced apart parallel relation to the mount member, an annular spring washer disposed between the bearing one end and the spark advance member for yield- "ably urging the members apart, a plurality of slide surfaces on one member and facing away from the other member, and a like plurality of hook shaped runners on the other member disposed toward and extending around the one member to the surfaces whereby each runner is urged by the spring against a surface to form the sole means of axial support for the spark advance member.

6. For use in a spark advance mechanism of an internal combustion engine in an outboard motor, a stationary member, a spark advance member spaced apart from the stationary member and movable about a rotation axis, a plurality of pairs of facing surfaces respectively having one surface of each pair disposed on each member, a surface in each pair extending concentric about the rotation axis for providing a timing adjustment range, one of the surfaces in each pair being on a hook shaped runner extending from one member axially beyond and radially outward of the other member, the members having a radial notch adjacent one surface in each pair and being .in extent for permitting the other surface in the same pair to axially move therethrough, means engaging the spark member for yield-ably urging it away from the stationary member to respectively interengage the facing surfaces of each pair, and the spark member being movable for aligning the one surfaces in each pair with the other surface notch whereby the one surfaces may be respectively axially moved through the notches for separating the members.

7. For mounting ignition breaker points adjacent a timing cam section of an internal combustion engine timing shaft, a plate member stationarily associated with the engine, a spark advance member disposed in juxtaposition with the plate member and being concentrically movable with respect to the shaft adjacent its cam section, one of the members having a plurality of surfaces facing away from the other member, and the other member having a plurality of hook shaped runners engaging the surfaces for movement thereon concentric with the shaft for advancing and retarding the spark.

8. For mounting ignition breaker points adjacent a timing cam section of an internal combustion engine timing shaft, a plate member stationarily associated with the engine, a spark advance member disposed in juxtaposition with the plate member and being concentric with the shaft for movement thereabout adjacent the cam section, one of the members having a plurality of surfaces facing away from the other member, the other member having a plurality of hook shaped runners each having an anti-friction portion disposed in juxtaposition with one of the surfaces, and spring means engaging the other member for urging the portions to respectively engage the one surfaces.

9. For use in a spark advance of an internal combustion engine, a stationary mount member, a timing shaft adjacently and rotatably disposed with respect to the member, a spark advance member journalled for concentric rotative movement and movably disposed in parallel spaced-apart relation to the stationary member, one of the members having a plurality of book shaped members extending toward and beyond the other one of the members and being radially outward therefrom and having a portion extending radially inwardly of said other memher, a like plurality of facing anti-friction surface pairs one of which in each pair extends concentrically with respect to the shaft, the surfaces in each pair being respectively stationarily associated with said other member and facing away from the one member and being adjacent the respective hook shaped members in the portion beyond said other member, spring means adjacent the shaft and operatively engaging the spark advance member for yieldably urging it away from the stationary member for interengaging the paired surfaces to axially support the spark member, and said other member having a like plurality of radial notches in its outer periphery respectively adjacent the one member surfaces at like circumferential ends and being in extent such that the hook members may respectively axially move therethrough whereby as the spark advance member is rotated until the notches and hook members are respectively aligned the spark advance member may be axially moved away from the stationary members.

10. For use in a spark advance device of an internal combustion engine, a timing shaft, a stationary member, a spark advance member spaced apart from the other member and circumferentially movable with respect to the timing shaft, one of said members having a plurality of circumferentially extending slide surfaces facing away from the other member, said surfaces extending like distances from the center of said member and with respect to said shaft for providing a timing adjustment range, a like plurality of axially extending members having circumferentially inwardly extending portions at the ex tremities thereof mounted on the other of said members and means for biasing one of said members with respect to the other of said members so as to engage the inwardly circumferentially extending portions of said axially extending members with said slide surfaces.

11. For mounting ignition breaker points adjacent a timing cam section of an internal combustion engine timing shaft, a plate member stationarily associated wi h the engine, a spark advance member disposed in juxtaposition with the plate member and being concentrically movable with respect to the shaft adjacent its cam section, one of the members having a plurality of surfaces facing away from the other member, and the other member having a plurality of axially extending members having inwardly circumferentially extending end portions in engagement with the surfaces for movement thereon concentric with the shaft for advancing and retarding the spark.

12. Formounting ignition breaker points adjacent the timing cam section of an internal combustion engine timing shaft, a plate member stationarily associated with the engine, a spark advance member disposed in juxtaposition with the plate member and being concentric with the shaft for movement thereabout adjacent the cam section, one of the members having a plurality of surfaces facing away from the other member and extending circumferentially and concentrically outward from the center thereof, the other member having like plurality of axially extending members each having an inwardly circumferentially extending anti-friction portion disposed in juxtaposition with one of said surfaces, and means biasing one of said members with respect to the other of said mem- 6 bers so as to provide engagement of said surfaces with said anti-friction portions on said axially extending members.

References Cited in the file of this patent UNITED STATES PATENTS 2,196,682 Nowasielski Apr. 9, 1940 2,348,236 Arthur May 9, 1944 2,546,710 Aldridge Mar. 27, 1951 2,643,304 Lautzenhiser June 23, 1953 2,801,304 Winkley July 30, 1955 2,730,583 Brunk Jan. 10, 1956 

